Features: * Optional 58 Rinatones bring you colorful smater life. Choose your favorite ringtone based on your personal preference, making it your intimate friend. * Add 433Mhz wireless sensors to your doorbell system. Working together with door/PIR motion/smoke sensors etc, making your doorbell a burglar alarm system. (Detection sensors not included) * Tuya APP remote control, and compatible with Amazon Alexa, Google Assistant for voice control. * When a visitor presses the doorbell, loud sound is activated with Tuya APP notification to remind you to open the door. You will never miss a visitor. * Upgraded the design of the receiver station, so that it won\'t block off any neighboring power sockets. * Indoor doorbell hub is plug and play, no need batteries, low power consumption.Outdoor doorbell button with anti-tamper alarm function. * Support phone remote arm / disarm / intercom / monitoring function. * Support 5 groups preset alarm phone numbers, SMS on / off and dial on / off can be set respectively for each phone number. * Support 5 kinds of wireless defense zones mode, can be set as doorbell mode. * Can record 20 seconds alarm voice. * Support SMS remote setting. Hub